There's no way to configure headers for Notification Rules associated with a PI AF Services v2017 SP1 Elements with a SOAP or REST Web Service Endpoint. Authenticated web services, such as our company's Maximo's meter data inbound service requires a MAXAUTH header with a base64-encrypted username:password string. As a result, you can't use PI as a source of data for Maximo's condition-based maintenance triggers and automated asset meter reading updates, if Maximo uses authentication on its web services. That's a fairly common scenario with a high rate of return on the PI-Maximo integration efforts for a lot of customers.
Originally posted on UserVoice